Lexmark MX421 Users Guide PDF - Page 195
Horizontal light bands, Step 6, Warning-Potential Damage
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Troubleshooting Action Yes Step 6 a Remove the imaging unit. Go to step 7. Warning-Potential Damage: Do not expose the imaging unit to direct light for more than 10 minutes. Extended exposure to light may cause print quality problems. Warning-Potential Damage: Do not touch the photoconductor drum under the imaging unit. Doing so may affect the quality of future print jobs. b Remove any packing material that is stuck on the imaging unit. 195 No The problem is solved. Note: Make sure to remove any obstruction between the charge roller and photoconductor drum. c Insert the imaging unit. d Print the document. Does gray background appear on prints? Step 7 a Replace the imaging unit. b Print the document. Does gray background appear on prints? Contact customer The problem is support. solved. Horizontal light bands Note: Before solving the problem, print the Print Quality Test Pages. From the control panel, navigate to Settings > Troubleshooting > Print Quality Test Pages. For non‑touch‑screen printer models, press to navigate through the settings.